why is the sky blue???

Answer 1

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Answer 2

The answer is Rayleigh scattering. Shorter wavelengths are more readily absorbed by dust particles (and other obstacles) than longer wavelengths. This is also why you need only one subwoofer but many tweeters in an audio system. The higher frequencies are muffled when there are obstacles in their path, such as furniture.

Among visible colors, red has the shortest wavelength and violet has the longest. The airborne dust particles tend to block the red end of the spectrum while the violet end is transmitted more easily.

Think of it this way. Suppose there is a travelling wave approaching a particle. When the particle is small enough, and the wavelength is long enough, the wave can simply bypass the particle, and there is no loss of power. Conversely, if the particle is large relative to the wavelength, the wave will not be able to bypass the particle as easily.

Answer 3

Light is an electromagnetic wave. If you stand in one spot as a light wave passes by, there will be an oscillating electric field and an oscillating magnetic field, which are perpendicular to each other. If the light is in the range of frequencies that we can see, then the frequency of the vibration affects the color of the light. The color-vision receptors in our eyes, the cones, are of three types: "blue" receptors that respond to light over a broad range of high frequencies, "green" receptors that respond to medium frequencies, and "red" receptors that respond to low frequencies. The ranges of sensitivity of the receptors overlap considerably, but they have their maximum sensitivities at different frequencies. The perceived color depends (among other things) on the relative strengths of the signals from these receptors.

Molecules are usually electrically neutral, but they are made of charged objects: their atoms consist of negatively charged electrons and positively charged nuclei. If there is an electric field at the position of an atom, the nucleus will move a short distance in the direction of the field and the electrons will move the other way, and the atom will become a "dipole": the positive and negative charge will be centered around different places. A molecule made of such atoms will acquire its own electric field, something like the magnetic field of a bar magnet.

A dipole's electric field falls off more rapidly with distance than it would if the molecule had a net electric charge. This is because at large distances, the fields from the positive and the negative charge tend to cancel each other out, as the difference between their average positions becomes less important.

However, if the dipole is made to oscillate-- that is, if the positive and negative charge wiggle back and forth, out of phase with each other-- then the molecule can produce electromagnetic radiation of its own, for reasons I'll explain below. This is how air molecules scatter light: the oscillating electric field of the incoming wave makes the molecules develop oscillating dipoles, which in turn give off radiation.

The radiation destructively interferes with the incoming wave in the forward direction. The original wave is lessened in intensity, and new waves move out in all other directions, so that overall energy is conserved (this requirement is sometimes called the "optical theorem"). The net effect is that light energy that was moving in a straight line from the sun ends up traveling in some other direction.

Since sunlight appears white but the sky is a robin's-egg blue, it must be that the scattered light excites our blue-sensing cones more, and our red-sensing cones less, than the original sunlight. The distribution of frequencies in the scattered light must be biased toward high frequencies.

Answer 4

The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.

Answer 5

Light coming from the sun is what's called "white light" White light contains all the colors of the rainbow. When it enters Earth's atmosphere this light is separated into its individual colors by chemical elements in the atmosphere and scattered across the sky. Nitrogen is the most abundant element in our atmosphere, and that element scatters the color blue across our sky more than the other colors. In space, there is no atmosphere to separate colors from the white light and space looks black.

Answer 6

Because the bonding angle of nitrogen preferentially scatters blue wavelengths more than any other.


Doug

Answer 7

I have an absolute answer, Sky is blue because God likes it..

Now try to deny this because of wave length of ligth dispersion or other scientific data ??

you do not need to know that, just enjoy it...

Answer 8

The air is about 80% nitrogen and nitrogen reflects blue (actually absorbs blue).

Answer 9

the sun light is mixtureof 7 colours, among them blue colour is most scattered colour

Answer 10

cause the grass is green